Biomass is basically the byproduct of living organisms, such as biogas or methane, wood or other plant matter, manure and other organic wastes. It can be used to produce heat, combustible gas (for fridges and ovens), and a fuel for electricity producing generators.
Biogas, or methane, is a naturally occurring gas that is a waste product of a specific type of methane-producing bacteria. The gas can be used for cooking, heating, refrigeration, and even as a fuel for a gas generator.